package com.example.jam.musicplayer;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.support.v4.app.NotificationCompat;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.view.View;
import android.widget.RemoteViews;
import android.widget.Toast;

import com.example.jam.musicplayer.data.MusicList;

import java.util.Random;

public class MusicService extends Service {

    //控制命令，标识操作
    public static final int COMMAND_UNKOWN = -1;
    public static final int COMMAND_PLAY = 0;
    public static final int COMMAND_PAUSE = 1;
    public static final int COMMAND_STOP = 2;
    public static final int COMMAND_RESUME = 3;
    public static final int COMMAND_PREVIOUS = 4;
    public static final int COMMAND_NEXT = 5;
    public static final int COMMAND_CHECK_IS_PLAYING = 6;
    public static final int COMMAND_SEEK_TO = 7;
    public static final int COMMAND_RANDOM=8;

    //播放器状态
    public static final int STATUS_PLAYING = 0;
    public static final int STATUS_PAUSED = 1;
    public static final int STATUS_STOPPED = 2;
    public static final int STATUS_COMPLETED = 3;

    //广播标识
    public static final String BROADCAST_MUSICSERVICE_CONTROL = "MusicService.ACTION_CONTROL";
    public static final String BROADCAST_MUSICSERVICE_UPDATE_STATUS = "MusicService.ACTION_UPDATE";

    //歌曲序号，从0开始
    private int number = 0;
    private int status;
    private boolean phone =false;

    //媒体播放类
    private MediaPlayer player = new MediaPlayer();

    private NotificationManager manager;

    //广播接收器
    private CommandReceiver receiver;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    public void updateNotification(){
        manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
        RemoteViews views = new RemoteViews(getPackageName(),R.layout.statusbar);
        views.setImageViewResource(R.id.icon,R.drawable.player);
        views.setTextViewText(R.id.musicName,MusicList.getMusicList().get(number).getMusicName());
        views.setTextViewText(R.id.artist,MusicList.getMusicList().get(number).getMusicArtist());

        if(status == MusicService.STATUS_PLAYING){
            views.setViewVisibility(R.id.play_play, View.GONE);
            views.setViewVisibility(R.id.play_pause,View.VISIBLE);
        }else{
            views.setViewVisibility(R.id.play_play, View.VISIBLE);
            views.setViewVisibility(R.id.play_pause,View.GONE);
        }

        views.setOnClickPendingIntent(R.id.play_previous,pre_PendingIntent());
        views.setOnClickPendingIntent(R.id.play_play,play_PendingIntent());
        views.setOnClickPendingIntent(R.id.play_pause,pause_PendingIntent());
        views.setOnClickPendingIntent(R.id.play_next,next_PendingIntent());
        views.setOnClickPendingIntent(R.id.close,close_PendingIntent());

        Intent intent = new Intent(this,musicplayer.class);
        PendingIntent pendingInent = PendingIntent.getActivity(this,0,intent,0);
        builder.setContent(views)
                .setContentIntent(pendingInent)
                .setPriority(Notification.PRIORITY_MAX)
                .setOngoing(true)
                .setSmallIcon(R.drawable.ap_icon_on);
        Notification notification = builder.build();
        notification.flags = Notification.FLAG_ONGOING_EVENT;
        manager.notify(0x3131,notification);
    }

    private PendingIntent close_PendingIntent(){
        Intent intent = new Intent("CLOSE");
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this,0,intent,0);
        return pendingIntent;
    }

    private PendingIntent next_PendingIntent(){
        Intent intent = new Intent("NEXT");
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this,0,intent,0);
        return pendingIntent;
    }

    private PendingIntent pause_PendingIntent(){
        Intent intent = new Intent("PAUSE");
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this,0,intent,0);
        return pendingIntent;
    }

    private PendingIntent play_PendingIntent(){
        Intent intent = new Intent("RESUME");
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this,0,intent,0);
        return pendingIntent;
    }
    private PendingIntent pre_PendingIntent(){
        Intent intent = new Intent("PREVIOUS");
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this,0,intent,0);
        return pendingIntent;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        bindCommandReceiver();
        TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
        telephonyManager.listen(new MyPhoneListener(), PhoneStateListener.LISTEN_CALL_STATE);
        //Toast.makeText(this,"MusicService onCreate", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onDestroy() {
        sendBroadcastOnStatusChanged(MusicService.STATUS_STOPPED);
        manager.cancel(0x3131);
        if (status == MusicService.STATUS_STOPPED) {
            stopService(new Intent(this, MusicService.class));
        }
        super.onDestroy();
    }

    class CommandReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String ctrl_code = intent.getAction();
            if(BROADCAST_MUSICSERVICE_CONTROL.equals(ctrl_code)) {
                int command = intent.getIntExtra("command", COMMAND_UNKOWN);

                switch (command) {
                    case COMMAND_SEEK_TO:
                        seekTo(intent.getIntExtra("time", 0));
                        break;
                    case COMMAND_PLAY:
                        number = intent.getIntExtra("number", 0);
                        play(number);
                        break;
                    case COMMAND_PREVIOUS:
                        moveNumberToPrevious();
                        break;
                    case COMMAND_NEXT:
                        moveNumberToNext();
                        break;
                    case COMMAND_PAUSE:
                        pause();
                        break;
                    case COMMAND_STOP:
                        stop();
                        break;
                    case COMMAND_RESUME:
                        resume();
                        break;
                    case COMMAND_CHECK_IS_PLAYING:
                        if (player != null && player.isPlaying()) {
                            sendBroadcastOnStatusChanged(MusicService.STATUS_PLAYING);
                        }
                        break;
                    case COMMAND_RANDOM:
                        Random randomnum = new Random();
                        int i;
                        do {
                            i = randomnum.nextInt(MusicList.getMusicList().size() - 1);
                        } while (i == number);
                        number = i;
                        play(number);
                        break;
                    case COMMAND_UNKOWN:
                    default:
                        break;
                }
            }else if("RESUME".equals(ctrl_code)){
                resume();
            }else if("PAUSE".equals(ctrl_code)){
                pause();
            }else if("PREVIOUS".equals(ctrl_code)){
                moveNumberToPrevious();
            }else if("NEXT".equals(ctrl_code)){
                moveNumberToNext();
            }else if("CLOSE".equals(ctrl_code)){
                manager.cancel(0x3131);
                System.exit(0);
            }
        }
    }

    /**绑定广播接收器*/
    private void bindCommandReceiver() {
        receiver = new CommandReceiver();
        IntentFilter filter = new IntentFilter(BROADCAST_MUSICSERVICE_CONTROL);
        filter.addAction(BROADCAST_MUSICSERVICE_CONTROL);
        filter.addAction("RESUME");
        filter.addAction("PAUSE");
        filter.addAction("PREVIOUS");
        filter.addAction("NEXT");
        filter.addAction("CLOSE");
        filter.addAction("SLEEPTIME");
        registerReceiver(receiver, filter);
    }

    /**发送广播*/
    private void sendBroadcastOnStatusChanged(int status) {
        Intent intent = new Intent(BROADCAST_MUSICSERVICE_UPDATE_STATUS);
        intent.putExtra("status", status);
        if(status != MusicService.STATUS_STOPPED)
        {
            intent.putExtra("musicName",MusicList.getMusicList().get(number).getMusicName());
            intent.putExtra("musicArtist",MusicList.getMusicList().get(number).getMusicArtist());
            intent.putExtra("album",MusicList.getMusicList().get(number).getMusicAlbum());
            intent.putExtra("time",player.getCurrentPosition());
            intent.putExtra("duration",player.getDuration());
            intent.putExtra("number",number);
        }
        sendBroadcast(intent);
    }

    /** 读取音乐文件 */
    private void load(int number){
        try{
            player.reset();
            player.setDataSource(MusicList.getMusicList().get(number).getMusicPath());
            player.prepare();
        }catch (Exception e){
            e.printStackTrace();
        }
        //注册监听器
        player.setOnCompletionListener(completionListener);
    }
    //播放结束监听器
    MediaPlayer.OnCompletionListener completionListener = new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mp) {
            if (player.isLooping()) {
                replay();
            } else {
                sendBroadcastOnStatusChanged(MusicService.STATUS_COMPLETED);
            }
        }
    };

    /** 播放音乐 */
    private void play(int number) {
        // 停止当前播放
        if (player != null && player.isPlaying()) {
            player.stop();
        }
        load(number);
        player.start();
        status = MusicService.STATUS_PLAYING;
        sendBroadcastOnStatusChanged(MusicService.STATUS_PLAYING);
        updateNotification();
    }
    /** 暂停音乐 */
    private void pause() {
        if (player.isPlaying()) {
            player.pause();
            status = MusicService.STATUS_PAUSED;
            sendBroadcastOnStatusChanged(MusicService.STATUS_PAUSED);
            updateNotification();
        }
    }
    /** 停止播放 */
    private void stop() {
        if (status != MusicService.STATUS_STOPPED) {
            player.stop();
            status = MusicService.STATUS_STOPPED;
            sendBroadcastOnStatusChanged(MusicService.STATUS_STOPPED);
            updateNotification();
        }
    }
    /** 恢复播放（暂停之后） */
    private void resume() {
        player.start();
        status = MusicService.STATUS_PLAYING;
        sendBroadcastOnStatusChanged(MusicService.STATUS_PLAYING);
        updateNotification();
    }
    /** 重新播放（播放完成之后） */
    private void replay() {
        player.start();
        status = MusicService.STATUS_PLAYING;
        sendBroadcastOnStatusChanged(MusicService.STATUS_PLAYING);
        updateNotification();
    }

    private void seekTo(int time)
    {
        player.seekTo(time);
        status = MusicService.STATUS_PLAYING;
        sendBroadcastOnStatusChanged(MusicService.STATUS_PLAYING);
        updateNotification();
    }

    /** 选择下一曲 */
    private void moveNumberToNext() {
        // 判断是否到达了列表底端
        if(number == MusicList.getMusicList().size() - 1) {
            Toast.makeText(MusicService.this, MusicService.this.getString(R.string.tip_reach_bottom),Toast.LENGTH_SHORT).show();
            number = 0;
            play(number);
        }else {
            ++number;
            play(number);
        }
    }

    /** 选择上一曲 */
    private void moveNumberToPrevious() {
        // 判断是否到达了列表顶端
        if (number == 0) {
            Toast.makeText(MusicService.this,MusicService.this.getString(R.string.tip_reach_top),Toast.LENGTH_SHORT).show();
            number = MusicList.getMusicList().size() - 1;
            play(number);
        } else {
            --number;
            play(number);
        }
    }

    /**
     * 函数名：MyPhoneListener
     * 功能：监听手机是否处于打电话状态，如果是就暂停音乐播放；当结束通话之后，恢复音乐播放
     * */
    private final class MyPhoneListener extends PhoneStateListener{
        @Override
        public void onCallStateChanged(int state, String phoneNumber) {
            switch (state){
                case TelephonyManager.CALL_STATE_RINGING:
                    if(status == MusicService.STATUS_PLAYING){
                        pause();
                        phone = true;
                    }
                    break;
                case TelephonyManager.CALL_STATE_IDLE:
                    if(phone == true){
                        resume();
                        phone = false;
                    }
                    break;
            }

        }
    }

}
